This is an AeroTech 29mm RMS G64-4W Rocket Motor Reload, and is intended for use in RMS 29mm E, F and G Motors. This reload kit is intended to be used only with AeroTech Reloadable System (RMS) Hardware. AeroTech’s unique and patented Reloadable Motor System (RMS) model rocket motors deliver D, E, F, and G power at the lowest per flight cost available in hobby rocketry!